'\" t
.\" Copyright (c) 1994, 2014, Oracle and/or its affiliates. All rights reserved.
.\" DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
.\"
.\" This code is free software; you can redistribute it and/or modify it
.\" under the terms of the GNU General Public License version 2 only, as
.\" published by the Free Software Foundation.
.\"
.\" This code is distributed in the hope that it will be useful, but WITHOUT
.\" ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
.\" FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
.\" version 2 for more details (a copy is included in the LICENSE file that
.\" accompanied this code).
.\"
.\" You should have received a copy of the GNU General Public License version
.\" 2 along with this work; if not, write to the Free Software Foundation,
.\" Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
.\"
.\" Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
.\" or visit www.oracle.com if you need additional information or have any
.\" questions.
.\"
.\" Title: javap
.\" Language: English
.\" Date: 8 August 2014
.\" SectDesc: Basic Tools
.\" Software: JDK 8
.\" Arch: generic
.\" Part Number: E38207-03
.\"
.if n .pl 99999
.TH "javap" "1" "8 August 2014" "JDK 8" "Basic Tools"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
javap \- Disassembles one or more class files\&.
.SH "SYNOPSIS"
.sp
.if n \{\
.RS 4
.\}
.nf
\fBjavap\fR [\fIoptions\fR] \fIclassfile\fR\&.\&.\&.
.fi
.if n \{\
.RE
.\}
.PP
\fIoptions\fR
.RS 4
The command\-line options\&. See Options\&.
.RE
.PP
\fIclassfile\fR
.RS 4
One or more classes separated by spaces to be processed for annotations such as DocFooter\&.class\&. You can specify a class that can be found in the class path, by its file name or with a URL such as
\fBfile:///home/user/myproject/src/DocFooter\&.class\fR\&.
.RE
.SH "DESCRIPTION"
.PP
The
\fBjavap\fR
command disassembles one or more class files\&. The output depends on the options used\&. When no options are used, then the
\fBjavap\fR
command prints the package, protected and public fields, and methods of the classes passed to it\&. The
\fBjavap\fR
command prints its output to
\fBstdout\fR\&.
.SH "OPTIONS"
.PP
\-help
.br
\-\-help
.br
\-?
.RS 4
Prints a help message for the
\fBjavap\fR
command\&.
.RE
.PP
\-version
.RS 4
Prints release information\&.
.RE
.PP
\-l
.RS 4
Prints line and local variable tables\&.
.RE
.PP
\-public
.RS 4
Shows only public classes and members\&.
.RE
.PP
\-protected
.RS 4
Shows only protected and public classes and members\&.
.RE
.PP
\-private
.br
\-p
.RS 4
Shows all classes and members\&.
.RE
.PP
\-J\fIoption\fR
.RS 4
Passes the specified option to the JVM\&. For example:
.sp
.if n \{\
.RS 4
.\}
.nf
\fBjavap \-J\-version\fR
\fBjavap \-J\-Djava\&.security\&.manager \-J\-Djava\&.security\&.policy=MyPolicy MyClassName\fR
 
.fi
.if n \{\
.RE
.\}
For more information about JVM options, see the command documentation\&.
.RE
.PP
\-s
.RS 4
Prints internal type signatures\&.
.RE
.PP
\-sysinfo
.RS 4
Shows system information (path, size, date, MD5 hash) of the class being processed\&.
.RE
.PP
\-constants
.RS 4
Shows
\fBstatic final\fR
constants\&.
.RE
.PP
\-c
.RS 4
Prints disassembled code, for example, the instructions that comprise the Java bytecodes, for each of the methods in the class\&.
.RE
.PP
\-verbose
.RS 4
Prints stack size, number of locals and arguments for methods\&.
.RE
.PP
\-classpath \fIpath\fR
.RS 4
Specifies the path the
\fBjavap\fR
command uses to look up classes\&. Overrides the default or the
\fBCLASSPATH\fR
environment variable when it is set\&.
.RE
.PP
\-bootclasspath \fIpath\fR
.RS 4
Specifies the path from which to load bootstrap classes\&. By default, the bootstrap classes are the classes that implement the core Java platform located in
\fBjre/lib/rt\&.jar\fR
and several other JAR files\&.
.RE
.PP
\-extdir \fIdirs\fR
.RS 4
Overrides the location at which installed extensions are searched for\&. The default location for extensions is the value of
\fBjava\&.ext\&.dirs\fR\&.
.RE
.SH "EXAMPLE"
.PP
Compile the following
\fBDocFooter\fR
class:
.sp
.if n \{\
.RS 4
.\}
.nf
\fBimport java\&.awt\&.*;\fR
\fBimport java\&.applet\&.*;\fR
\fB \fR
\fBpublic class DocFooter extends Applet {\fR
\fB        String date;\fR
\fB        String email;\fR
\fB \fR
\fB        public void init() {\fR
\fB                resize(500,100);\fR
\fB                date = getParameter("LAST_UPDATED");\fR
\fB                email = getParameter("EMAIL");\fR
\fB        }\fR
\fB \fR
\fB        public void paint(Graphics g) {\fR
\fB                g\&.drawString(date + " by ",100, 15);\fR
\fB                g\&.drawString(email,290,15);\fR
\fB        }\fR
\fB}\fR
 
.fi
.if n \{\
.RE
.\}
.PP
The output from the
\fBjavap DocFooter\&.class\fR
command yields the following:
.sp
.if n \{\
.RS 4
.\}
.nf
\fBCompiled from "DocFooter\&.java"\fR
\fBpublic class DocFooter extends java\&.applet\&.Applet {\fR
\fB  java\&.lang\&.String date;\fR
\fB  java\&.lang\&.String email;\fR
\fB  public DocFooter();\fR
\fB  public void init();\fR
\fB  public void paint(java\&.awt\&.Graphics);\fR
\fB}\fR
 
.fi
.if n \{\
.RE
.\}
.PP
The output from
\fBjavap \-c DocFooter\&.class\fR
command yields the following:
.sp
.if n \{\
.RS 4
.\}
.nf
\fBCompiled from "DocFooter\&.java"\fR
\fBpublic class DocFooter extends java\&.applet\&.Applet {\fR
\fB  java\&.lang\&.String date;\fR
\fB  java\&.lang\&.String email;\fR
 
\fB  public DocFooter();\fR
\fB    Code:\fR
\fB       0: aload_0       \fR
\fB       1: invokespecial #1                  // Method\fR
\fBjava/applet/Applet\&."<init>":()V\fR
\fB       4: return        \fR
 
\fB  public void init();\fR
\fB    Code:\fR
\fB       0: aload_0       \fR
\fB       1: sipush        500\fR
\fB       4: bipush        100\fR
\fB       6: invokevirtual #2                  // Method resize:(II)V\fR
\fB       9: aload_0       \fR
\fB      10: aload_0       \fR
\fB      11: ldc           #3                  // String LAST_UPDATED\fR
\fB      13: invokevirtual #4                  // Method\fR
\fB getParameter:(Ljava/lang/String;)Ljava/lang/String;\fR
\fB      16: putfield      #5                  // Field date:Ljava/lang/String;\fR
\fB      19: aload_0       \fR
\fB      20: aload_0       \fR
\fB      21: ldc           #6                  // String EMAIL\fR
\fB      23: invokevirtual #4                  // Method\fR
\fB getParameter:(Ljava/lang/String;)Ljava/lang/String;\fR
\fB      26: putfield      #7                  // Field email:Ljava/lang/String;\fR
\fB      29: return        \fR
 
\fB  public void paint(java\&.awt\&.Graphics);\fR
\fB    Code:\fR
\fB       0: aload_1       \fR
\fB       1: new           #8                  // class java/lang/StringBuilder\fR
\fB       4: dup           \fR
\fB       5: invokespecial #9                  // Method\fR
\fB java/lang/StringBuilder\&."<init>":()V\fR
\fB       8: aload_0       \fR
\fB       9: getfield      #5                  // Field date:Ljava/lang/String;\fR
\fB      12: invokevirtual #10                 // Method\fR
\fB java/lang/StringBuilder\&.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;\fR
\fB      15: ldc           #11                 // String  by \fR
\fB      17: invokevirtual #10                 // Method\fR
\fB java/lang/StringBuilder\&.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;\fR
\fB      20: invokevirtual #12                 // Method\fR
\fB java/lang/StringBuilder\&.toString:()Ljava/lang/String;\fR
\fB      23: bipush        100\fR
\fB      25: bipush        15\fR
\fB      27: invokevirtual #13                 // Method\fR
\fB java/awt/Graphics\&.drawString:(Ljava/lang/String;II)V\fR
\fB      30: aload_1       \fR
\fB      31: aload_0       \fR
\fB      32: getfield      #7                  // Field email:Ljava/lang/String;\fR
\fB      35: sipush        290\fR
\fB      38: bipush        15\fR
\fB      40: invokevirtual #13                 // Method\fR
\fBjava/awt/Graphics\&.drawString:(Ljava/lang/String;II)V\fR
\fB      43: return        \fR
\fB}\fR
 
.fi
.if n \{\
.RE
.\}
.SH "SEE ALSO"
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
java(1)
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
javac(1)
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
javadoc(1)
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
jdb(1)
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
jdeps(1)
.RE
.br
'pl 8.5i
'bp
